<?php

namespace app\common\service;

class AlipayPaymentService extends BasePaymentService
{
    // 支付宝API地址
    protected $apiUrl = 'https://openapi.alipay.com/gateway.do';

    // 配置参数
    protected $config = [];

    /**
     * 初始化支付宝配置
     */
    protected function initConfig()
    {
        $this->config = [
            'app_id' => $this->payConfig['app_id'],
            'merchant_private_key' => $this->getPrivateKey(),
            'alipay_public_key' => $this->getPublicKey(),
            'notify_url' => $this->payConfig['notify_url'] ?: url('/api/invitation/payment/alipayNotify', [], true, true)->build(),
            'charset' => 'UTF-8',
            'sign_type' => 'RSA2',
            'gateway_url' => $this->apiUrl,
        ];

        if (empty($this->config['app_id']) || empty($this->config['merchant_private_key'])) {
            throw new \Exception('支付宝支付配置不完整');
        }
    }

    /**
     * 获取私钥 - 修复版本
     */
    protected function getPrivateKey()
    {
        // 从文件路径读取或直接使用配置中的私钥
        $privateKey = '';

        if (!empty($this->payConfig['private_key_path']) && file_exists($this->payConfig['private_key_path'])) {
            $privateKey = file_get_contents($this->payConfig['private_key_path']);
        } elseif (!empty($this->payConfig['key'])) {
            // 如果没有文件路径，可能私钥直接存储在配置中
            $privateKey = $this->payConfig['key'];
        }

        if (empty($privateKey)) {
            throw new \Exception('私钥内容为空');
        }

        // 清理私钥格式
        $privateKey = $this->formatPrivateKey($privateKey);

        return $privateKey;
    }

    /**
     * 格式化私钥
     */
    protected function formatPrivateKey($privateKey)
    {
        // 移除可能的开头和结尾标记
        $privateKey = str_replace([
            '-----BEGIN PRIVATE KEY-----',
            '-----END PRIVATE KEY-----',
            '-----BEGIN RSA PRIVATE KEY-----',
            '-----END RSA PRIVATE KEY-----',
            "\r",
            "\n"
        ], '', $privateKey);

        // 确保私钥是完整的行（每行64字符）
        $privateKey = chunk_split($privateKey, 64, "\n");

        // 添加 PKCS#1 格式的标记（支付宝推荐格式）
        $privateKey = "-----BEGIN RSA PRIVATE KEY-----\n" . $privateKey . "-----END RSA PRIVATE KEY-----\n";

        return $privateKey;
    }

    /**
     * 获取公钥
     */
    protected function getPublicKey()
    {
        if (!empty($this->payConfig['public_key_path']) && file_exists($this->payConfig['public_key_path'])) {
            return file_get_contents($this->payConfig['public_key_path']);
        }

        return '';
    }

    /**
     * 生成支付二维码
     */
    public function createQrCode($orderNo, $amount, $subject, $body = '')
    {
        try {
            // 业务参数
            $bizContent = [
                'out_trade_no' => $orderNo,
                'total_amount' => number_format($amount, 2, '.', ''),
                'subject' => $subject,
                'body' => $body ?: $subject,
                'product_code' => 'FAST_INSTANT_TRADE_PAY',
            ];
            // 公共参数
            $params = [
                'app_id' => $this->config['app_id'],
                'method' => 'alipay.trade.precreate',
                'charset' => $this->config['charset'],
                'sign_type' => $this->config['sign_type'],
                'timestamp' => date('Y-m-d H:i:s'),
                'version' => '1.0',
                'notify_url' => $this->config['notify_url'],
                'biz_content' => json_encode($bizContent, JSON_UNESCAPED_UNICODE),
            ];

            // 生成签名
            $params['sign'] = $this->generateSign($params);

            // 发送请求
            $result = $this->execute($params);

            $response = $result['alipay_trade_precreate_response'];

            if ($response['code'] == '10000') {
                return [
                    'qr_code_url' => $response['qr_code'],
                    'qr_code_content' => $response['qr_code'],
                    'out_request_no' => $response['out_trade_no'],
                ];
            } else {
                $errorMsg = $response['sub_msg'] ?? $response['msg'] ?? '支付宝下单失败';
                throw new \Exception($errorMsg);
            }

        } catch (\Throwable $e) {
            $this->log('生成支付宝支付二维码失败', [
                'order_no' => $orderNo,
                'error' => $e->getMessage()
            ], 'error');
            throw $e;
        }
    }

    /**
     * 处理支付回调
     */
    public function handleNotify($input)
    {
        try {
            // 验证签名
            if (!$this->verifySign($input)) {
                throw new \Exception('签名验证失败');
            }

            // 检查交易状态
            $tradeStatus = $input['trade_status'];
            if (!in_array($tradeStatus, ['TRADE_SUCCESS', 'TRADE_FINISHED'])) {
                throw new \Exception('支付未成功: ' . $tradeStatus);
            }

            return [
                'order_no' => $input['out_trade_no'],
                'trade_no' => $input['trade_no'],
                'pay_amount' => $input['total_amount'],
                'pay_time' => $input['gmt_payment'] ?? date('Y-m-d H:i:s'),
                'raw_data' => $input,
            ];

        } catch (\Throwable $e) {
            $this->log('处理支付宝支付回调失败', [
                'input' => $input,
                'error' => $e->getMessage()
            ], 'error');
            throw $e;
        }
    }

    /**
     * 查询支付订单
     */
    public function queryOrder($orderNo)
    {
        try {
            // 业务参数
            $bizContent = [
                'out_trade_no' => $orderNo,
            ];

            // 公共参数
            $params = [
                'app_id' => $this->config['app_id'],
                'method' => 'alipay.trade.query',
                'charset' => $this->config['charset'],
                'sign_type' => $this->config['sign_type'],
                'timestamp' => date('Y-m-d H:i:s'),
                'version' => '1.0',
                'biz_content' => json_encode($bizContent, JSON_UNESCAPED_UNICODE),
            ];

            $params['sign'] = $this->generateSign($params);

            $result = $this->execute($params);
            $response = $result['alipay_trade_query_response'];

            if ($response['code'] == '10000') {
                $tradeStatus = $response['trade_status'];
                $payStatus = 0; // 待支付

                if (in_array($tradeStatus, ['TRADE_SUCCESS', 'TRADE_FINISHED'])) {
                    $payStatus = 1; // 已支付
                } elseif ($tradeStatus == 'TRADE_CLOSED') {
                    $payStatus = 2; // 支付失败
                }

                return [
                    'order_no' => $response['out_trade_no'],
                    'trade_no' => $response['trade_no'],
                    'pay_status' => $payStatus,
                    'pay_amount' => $response['total_amount'],
                    'pay_time' => $response['send_pay_date'] ?? null,
                    'trade_status' => $tradeStatus,
                ];
            } elseif ($response['code'] == '40004') {
                // 订单不存在，可能是未支付
                return [
                    'order_no' => $orderNo,
                    'pay_status' => 0,
                    'trade_status' => 'WAIT_BUYER_PAY',
                ];
            }

            throw new \Exception('查询订单失败: ' . ($response['sub_msg'] ?? $response['msg'] ?? '未知错误'));

        } catch (\Throwable $e) {
            $this->log('查询支付宝支付订单失败', [
                'order_no' => $orderNo,
                'error' => $e->getMessage()
            ], 'error');
            throw $e;
        }
    }

    /**
     * 验证签名
     */
    protected function verifySign($data, $sign = null)
    {
        $sign = $data['sign'];
        $signType = $data['sign_type'];

        // 移除sign和sign_type参数
        unset($data['sign'], $data['sign_type']);

        // 参数排序
        ksort($data);

        // 拼接待签名字符串
        $signContent = '';
        foreach ($data as $key => $value) {
            if ($value !== '' && $value !== null && $key != 'sign') {
                $signContent .= $key . '=' . $value . '&';
            }
        }
        $signContent = rtrim($signContent, '&');

        // 验证签名
        $publicKey = $this->config['alipay_public_key'];
        $res = openssl_get_publickey($publicKey);
        $result = openssl_verify($signContent, base64_decode($sign), $res, OPENSSL_ALGO_SHA256);
//        openssl_free_key($res);

        return $result === 1;
    }

    /**
     * 生成签名
     */
    protected function generateSign($data)
    {
        // 参数排序
        ksort($data);

        // 拼接待签名字符串
        $signContent = '';
        foreach ($data as $key => $value) {
            if ($value !== '' && $value !== null && $key != 'sign') {
                $signContent .= $key . '=' . $value . '&';
            }
        }
        $signContent = rtrim($signContent, '&');

        // 使用私钥生成签名
        $privateKey = $this->config['merchant_private_key'];
        $res = openssl_get_privatekey($privateKey);

        if (!$res) {
            throw new \Exception('私钥格式错误');
        }

        if ($this->config['sign_type'] == 'RSA2') {
            openssl_sign($signContent, $sign, $res, OPENSSL_ALGO_SHA256);
        } else {
            openssl_sign($signContent, $sign, $res);
        }

//        openssl_free_key($res);

        return base64_encode($sign);
    }

    /**
     * 执行请求 - 简化修复版本
     */
    private function execute($params)
    {
        $url = $this->config['gateway_url'];

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($params));
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

        $response = curl_exec($ch);

        if (curl_errno($ch)) {
            $error = curl_error($ch);
            curl_close($ch);
            throw new \Exception('CURL错误: ' . $error);
        }

        curl_close($ch);

        // 清理响应数据
        $response = trim($response);

        // 移除可能的BOM头
        if (substr($response, 0, 3) == "\xEF\xBB\xBF") {
            $response = substr($response, 3);
        }

        // 转换编码确保是UTF-8
        $encoding = mb_detect_encoding($response, ['UTF-8', 'GBK', 'GB2312', 'ASCII'], true);
        if ($encoding && $encoding != 'UTF-8') {
            $response = mb_convert_encoding($response, 'UTF-8', $encoding);
        }

        // 移除非法字符
        $response = iconv('UTF-8', 'UTF-8//IGNORE', $response);

        // 尝试解析
        $result = json_decode($response, true);

        if (json_last_error() !== JSON_ERROR_NONE) {
            // 记录详细的调试信息
            $errorDetails = [
                'error' => json_last_error_msg(),
                'response_length' => strlen($response),
                'response_preview' => substr($response, 0, 200),
                'response_end' => substr($response, -200)
            ];

            $this->log('支付宝API响应JSON解析失败', $errorDetails, 'error');

            // 尝试手动解析支付宝格式
            if (preg_match('/\{.*\}/s', $response, $matches)) {
                $jsonPart = $matches[0];
                $result = json_decode($jsonPart, true);

                if (json_last_error() === JSON_ERROR_NONE) {
                    return $result;
                }
            }

            throw new \Exception('JSON解析失败: ' . json_last_error_msg() . '，响应长度：' . strlen($response));
        }

        return $result;
    }
}